In formal situation, such as meeting, we can use white shirt and white headscarf. It will seem perfect if we use a white handbag for putting all of your stuffs. By using white color, the person will look better because white is a neutral color. Besides, you will be more comfortable in white color because white makes you look more fresh and brighter. Combine them with your black trousers. Formal is not always for using skirt, now trousers is also appropriate to be used.